CN109269942B - Overburden layer water-gas two-phase migration simulation test device, overburden layer water-gas two-phase migration simulation test method and overburden layer water-gas two-phase migration simulation test method - Google Patents
Overburden layer water-gas two-phase migration simulation test device, overburden layer water-gas two-phase migration simulation test method and overburden layer water-gas two-phase migration simulation test method Download PDFInfo
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- CN109269942B CN109269942B CN201810720951.4A CN201810720951A CN109269942B CN 109269942 B CN109269942 B CN 109269942B CN 201810720951 A CN201810720951 A CN 201810720951A CN 109269942 B CN109269942 B CN 109269942B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
Abstract
The invention discloses a water-gas two-phase migration simulation test device and a test method for an overlying soil layer. The invention also discloses a test device and a test method for simulating the water-gas two-phase migration of the overburden layer. The testing device and the testing method can test the possible states of groundwater permeability, underground gas upward permeability and rainwater downward permeability after the soil sample has different states in different natural environments by simulating various natural states.
Description
Technical Field
The invention relates to a water-gas two-phase migration simulation test device and a water-gas two-phase migration simulation test method for an overlying soil layer. The invention also relates to a test method adopting the overburden layer water-gas two-phase migration simulation test device and the test method.
Background
Landfill disposal is currently the preferred choice in many parts of the world. Landfill releases a large amount of methane gas, causing greenhouse effect, if the methane emission is not controlled, the consequences are serious! Physical properties of an upper covering layer of the refuse landfill can change under the coupling action of natural conditions such as wind, sunlight, rain and the like, so that the migration rule of rainwater on the upper part of the covering layer and methane gas generated on the lower part of the covering layer is changed. However, no device can test the migration rule of water and gas phases of the refuse landfill under the natural conditions.
Disclosure of Invention
The invention aims to solve the technical problem of providing a water-gas two-phase migration simulation test device and a test method for an overlying soil layer. The technical problem to be solved by the invention is also to provide a test method adopting the overburden water-gas two-phase migration simulation test device and the overburden water-gas two-phase migration simulation test method.
Therefore, the water-gas two-phase migration simulation test device and the test method for the overburden layer provided by the invention comprise a box body, wherein the bottom of the box body is provided with a bottom air inlet cavity which is connected with a gas conveying device, the middle part of the box body is provided with a soil layer interlayer, the soil layer interlayer is provided with a soil sample, the upper part of the box body is provided with an upper cavity and an ecological simulation device, the ecological simulation device comprises a rain mechanism, a sunshine mechanism and a circulating wind mechanism, the rain mechanism can guide water from the outside and cover the soil sample downwards in all directions, the sunshine mechanism comprises an irradiation lamp simulating sunlight, the circulating air mechanism comprises a circulating air inlet and a circulating air outlet which are staggered and separated and not in the same horizontal position, the circulating air inlet is connected with the air blowing device and is arranged on the side wall of the box body, the circulating air outlet is communicated with the outside and is arranged on the opposite side wall of the box body, and the bottom air inlet cavity is provided with a water diversion channel communicated with the outside.
The invention also provides a test method adopting the overburden layer water-gas two-phase migration simulation test device and the test method, which comprises the following steps:
A. the middle box body is detached and inserted into a natural soil body to be tested so as to dig a natural soil sample;
B. connecting and sealing the middle box body with the upper box body and the lower box body respectively;
C. the rain mechanism, the sunshine mechanism and the circulating air mechanism are started according to the simulation requirement of the natural environment, and the soil sample state which can occur under the natural environments such as soil body moistening, sunshine cracking, soil sample drying and the like is simulated;
D. and the circulating air inlet, the circulating air outlet and the water diversion channel are closed, air is input into the bottom air inlet cavity through the air input device under different soil sample states, and the air permeability of the bottom air inlet cavity is calculated by testing the air input amount of the upper cavity in unit time.
The invention has the technical effects that: the testing device and the testing method can test the possible states of groundwater permeability, underground gas upward permeability and rainwater downward permeability after the soil sample is in different states under different natural environments by simulating various natural states.
Drawings
Fig. 1 is a schematic structural diagram of a water-gas two-phase migration simulation test device and a test method for an overburden layer provided by the invention.
Detailed Description
The scope of the present invention is not limited to the following technical solutions, and embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the invention provides a water-gas two-phase migration simulation test device and a test method for an overlying soil layer, comprising a box body 1, wherein the bottom of the box body 1 is provided with a bottom air inlet cavity 2, the bottom air inlet cavity 2 is connected with a gas conveying device through an air inlet 20, the middle part of the box body 1 is provided with a soil interlayer 3, the soil interlayer 3 is provided with a soil sample, the upper part of the box body 1 is provided with an upper cavity 4 and an ecological simulation device, the ecological simulation device comprises a rain mechanism 5, a sunshine mechanism 6 and a circulating air mechanism, the rain mechanism 5 can guide water from the outside through an inlet pipe 21 and cover the soil sample downwards in an all-around manner, the sunshine mechanism 6 comprises a simulated sunlight irradiation lamp, the circulating air mechanism comprises a circulating air inlet 7 and a circulating air outlet 8 which are staggered and separated and are not at the same horizontal position, the circulating air inlet 7 is connected with a blast device and is arranged on the side wall of the box body, the circulating air outlet 8 is communicated with the outside and is arranged on the opposite side wall of the box body 1, and the bottom air inlet cavity 2 is provided with a water diversion channel 9 communicated with the outside.
The above-mentioned sunshine device is equipped with a controller to control the irradiation intensity of the sunshine device at each time interval, the raining mechanism 5 is equipped with a controller to control the rainfall amount and duration of the rainfall, and the circulating wind mechanism is equipped with a controller to control the wind power intensity and duration of the circulating wind mechanism; and a gas concentration sensor 14, a temperature sensor 15 and a humidity sensor 16 are arranged in the upper cavity 4, and a gas concentration sensor 14 is arranged in the bottom air inlet cavity 2.
In order to facilitate natural soil sampling, the box body comprises an upper box body 1A, a middle box body 1B and a lower box body 1C, the upper box body 1A, the middle box body 1B and the lower box body 1C are detachably and hermetically connected, the soil layer interlayer is arranged at the middle box body 1B, and the bottom of the middle box body 1B is provided with a ventilating grid 10. The upper box body 1A, the middle box body 1B and the lower box body 1C are mutually sleeved, and the sleeved part forms threaded connection and is provided with a sealing ring to keep sealing. And, the ring-shaped fixed distribution has upper flange 11 on the outer wall of said upper housing 1A, the ring-shaped fixed distribution has lower flange 12 on the outer wall of said lower housing 1B, upper flange 11 and lower flange 12 adopt the bolt 13 to strain and connect. The inner side wall of the middle box body 1B is provided with a matching surface 17 for simulating the roughness of the soil body, and the matching surface 17 can prevent a large amount of gas and rainwater from penetrating through the side wall to cause inaccurate test. Middle box 1B upper end is provided with annular brim of a hat 18, and annular brim of a hat 18 inner ring face department has the sealing washer, annular brim of a hat 18 has the arc upper surface 19 of leanin, and annular brim of a hat 18 card just forms sealed cooperation in going into middle box 1B, and annular brim of a hat 18 can make the upper portion drench down water and concentrate to the centre of soil sample as far as possible, and can not spill from the lateral wall.
Referring to fig. 1, the test method adopting the overburden water-gas two-phase migration simulation test device and the test method provided by the invention comprises the following steps:
A. the middle box body 1B is detached, and the middle box body 1B is inserted into a soil body in a natural state to be tested so as to dig a natural soil sample;
B. the middle box body 1B is respectively connected and sealed with the upper box body and the lower box body;
C. the rain mechanism 5, the sunshine mechanism 6 and the circulating air mechanism are started according to the simulation requirement of the natural environment, and the soil sample state which can occur in the natural environment such as soil body moistening, sunshine cracking, soil sample drying and the like is simulated;
D. the circulating air inlet 7, the circulating air outlet 8 and the water diversion channel 9 are closed, and gas is input into the bottom air inlet cavity 2 through the gas input device under different soil sample states, and the gas introduced into the bottom air inlet cavity 2 by the gas transmission device is CH4And/or H2And S, calculating the air permeability of the upper cavity 4 in unit time by testing the air inlet amount of the upper cavity.
Claims (1)
1. An overburden water-gas two-phase migration simulation test method adopts an overburden water-gas two-phase migration simulation test device which comprises a box body and is characterized in that: the bottom of the box body is provided with a bottom air inlet cavity, the bottom air inlet cavity is connected with a gas conveying device, the middle of the box body is provided with a soil layer interlayer, the soil layer interlayer is provided with a soil sample, the upper part of the box body is provided with an upper cavity and an ecological simulation device, the ecological simulation device comprises a rain mechanism, a sunshine mechanism and a circulating air mechanism, the rain mechanism can be used for conducting water from the outside and covering the soil sample downwards in an all-dimensional manner, the sunshine mechanism comprises an illuminating lamp for simulating sunlight, the circulating air mechanism comprises a circulating air inlet and a circulating air outlet which are staggered and separated and not in the same horizontal position, the circulating air inlet is connected with a blast device and arranged on the side wall of the box body, the circulating air outlet is communicated with the outside and arranged on the opposite side wall of the box body, and the bottom air inlet cavity is provided with a water diversion channel communicated with the outside; the box body comprises an upper box body, a middle box body and a lower box body, the upper box body, the middle box body and the lower box body are detachably and hermetically connected, an upper flange plate is annularly and fixedly distributed on the outer wall of the upper box body, a lower flange plate is annularly and fixedly distributed on the outer wall of the lower box body, the upper flange plate and the lower flange plate are connected in a tensioning mode through bolts, a soil layer interlayer is arranged at the middle box body, the bottom of the middle box body is provided with a ventilation grid, a matching surface simulating the roughness of a soil body is arranged on the inner side wall of the middle box body, an annular brim is arranged at the upper end of the middle box body, a sealing ring is arranged on the inner ring surface of the annular brim, and the annular brim is provided with an arc-shaped upper surface inclining inwards; the sunshine mechanism is provided with a controller to control the irradiation intensity of the sunshine mechanism in each period, the rain mechanism is provided with a controller to control the rainfall and the rainfall duration, and the circulating wind mechanism is provided with a controller to control the wind power intensity and the rainfall duration; a gas concentration sensor, a temperature sensor and a humidity sensor are arranged in the upper cavity, and a gas concentration sensor is arranged in the bottom air inlet cavity; the upper box body, the middle box body and the lower box body are mutually sleeved, a threaded connection is formed at the sleeved position, and a sealing ring is arranged to keep sealing; the gas introduced into the bottom gas inlet cavity by the gas conveying device is methane and/or hydrogen sulfide;
the test method comprises the following steps:
A. the middle box body is detached and inserted into a natural soil body to be tested so as to dig a natural soil sample;
B. connecting and sealing the middle box body with the upper box body and the lower box body respectively;
C. opening a rain mechanism, a sunshine mechanism and a circulating air mechanism according to the simulation requirement of the natural environment, and simulating the soil sample state which can occur in the natural environment of soil body moistening, sunshine cracking and soil sample drying;
D. the circulating air inlet, the circulating air outlet and the water diversion channel are closed, gas is input into the bottom air inlet cavity through the gas conveying device under different soil sample states, and the air permeability of the bottom air inlet cavity is calculated by testing the gas inlet amount of the upper cavity in unit time;
the water diversion channel is connected with the weighing device, the weighing device measures the water yield in unit time to measure and calculate the water permeability, the water diversion channel is connected with the water delivery device, the water delivery device inputs water and occupies the whole bottom air inlet cavity, underground water pressure is simulated according to the underground water pressure, and the critical value of upward water permeability of the underground water in different soil sample states is tested according to the upward water permeability amount and the continuous time of the underground water.
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| CN201810720951.4A CN109269942B (en) | 2018-07-04 | 2018-07-04 | Overburden layer water-gas two-phase migration simulation test device, overburden layer water-gas two-phase migration simulation test method and overburden layer water-gas two-phase migration simulation test method |
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| CN109269942A CN109269942A (en) | 2019-01-25 |
| CN109269942B true CN109269942B (en) | 2022-04-01 |
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